Implement retainer



e. H. FUEI-IIRER 2,265,427

IMPLEMENT RETAINER Filed Nov. 2, 1340 INVENTOR HIS ATTORNEY PatentedDec. 9, 1941 IMPLEMENT RETAINER George H. Fuehrer, Phillipsburg, N. Jassignor to Ingersoll-Rand'Company, New York, N. Y., a corporation ofNew Jersey Application November 2, 1940, Serial No. 363,975

Claims.

This invention relates to rock drills, and more particularly toimplement retainers for rock drills in which the working implement andthe elements actuating it are capable of reciprocatory movementindependently of each other.

One object of the invention is to assure the retention of the workingimplement in the rock drill.

Another object is to enable the working implement to be quickly insertedinto or removed from the rock drill.

Another object is to equip the rock drill with a rugged retaining devicecapable of fully withstanding the severe usage to which it is subjectedin practice.

Still another object is to minimize the number of parts that will besubjected to the wear incident to the impact of the working implement.

against the retaining device.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawing accompanying this specification and in which similarreference numerals refer to similar parts,

Figure l is an elevation, partly in section, of the front end of a rockdrill equipped with a steel retainer constructed in accordance with thepractice of the invention,

Figure 2 is a transverse view taken through Figure 1 on the line 2-2,and

Figure 3 is a side elevation of the front end of a rock drill and theimplement retainer.

Referring more particularly to the drawing, designates, in general, thefront end of a rock drill comprising a front head 2| having a bore 22,an intermediate portion 23 of which acts as a guide for the shank 24 ofa working implement 25.

At the rearward end of the intermediate portion 23 of the bore 22 is anenlarged recess 26 into which the free end of the shank 24 extends toreceive the blows of a hammer piston 21. The front end of the bore 22 islikewise in the form of an enlarged portion 28 to permit the readypassage therethrough of a collar 29 carried by the working implement andadapted to seat against the bottom 30 of the enlarged portion 28 tolimit the distance that the shank 24 may extend into the recess 26. Theenlarged portion 28 is of ample depth so that the collar 29 is capableof a considerable degree of movement longitudinally of the front headwithout moving out of the bore.

In accordance with the practice of the invention, the front head 2| isprovided with an aperture 3| that opens into the enlarged portion 28 ofthe bore to receive a retaining member 32 that extends loosely throughthe aperture 3| into the path of the collar 29. The front end of theaperture 3| serves as a seating surface 33 for the retaining member 32and is inclined from the bore 28 as is also the retaining member 32.

On the outer end of the retaining member 32 is a handle 34 that isintegral with the retaining .member, and the portion of the handle 34adjacent the retaining member is suitably guided by guide members 35lying on the opposite sides of the aperture 3| and extendinglongitudinally along the side of the front head 2|. The bottom of thespace between the guide members 35 serves as a seating surface 36 forthe portions of the handle lying immediately forwardly and rearwardly ofthe retaining member 32. It is off-set with respect to the side of thefront head So that the portion of the handle 34 lying above the guidemembers 35 will be capable of a considerable degree of rocking movementtoward the front head before contacting with the side thereof when thehandle is actuated to withdrawn the retaining member 32 out of the pathof the collar 29.

The retaining member and the handle are imperforate and, while intendedto describe a rocking movement, are not dependent for such movement upona fixed pivot. The retaining member 32 is both slidable upon andtiltable with respect to the seating surface 33. These movements areinduced when moving the retaining member out of the retaining position,as by pressure applied to the handle 34 to move the handle toward thefront head, as illustrated more particularly by the dot and dash lineshowing of the handle, by a fulcrum 31 at the upper end of the seatingsurface 36, said fulcrum. 31 being,

in the present instance, a corner resulting from the angularrelationship of the seating surface 36 and the adjacent surface of thefront head 2|.

The retaining member is held in assembled relationship with the fronthead by a spring 38 in the form of a loop that embraces the handle 34and the front head, these elements having notches 39 and 43,respectively, to receive portions of the spring. The notches are locatedin different transverse planes forwardly of the fulcrum 31 and the notch39 lies in a plane between the fulcrum and the transverse plane of thenotch 40.

In the form shown, the spring 38 consists largely of straight portionsthat are arranged angularly with respect to each other to conform,

roughly, to the contour of the front head. More specifically, the springhas a straight portion 4| to engage the notch 39 in the handle, and fromthe straight portion 4| diverge other straight portions 42 that arejoined with inwardly bent portions 43 to converging wings 44 havinginturned ends 45 that lie in the notch 40 and cooperate therewith toform a pivot for'the spring 38.

In order that the spring may at all times exert a suitable tension uponthe retaining member, the wings 44 are seated upon inclined seatingsurfaces 46 on the side of the front head and said seating surfaces areof such degree of in T clination that the wings 44 may readily slidethereon to permit the necessary degree of extension of the spring whenrockingthe handle 34 from one limiting position to the other and,

to secure the retaining member to the front head.

2. In an implement retainer, comprising in comprising in combinationwith a front head and a working implement having a collar, a seatingsurface on the front head, a retaining member seating upon the seatingsurface and extending into the pathv of the collar, a handle on theretaining member seating against the front head, a fulcrum on the fronthead for the handle, and a spring on the front head embracing the handleand movable to the opposite sides of the fulcrum for holding theretaining member in the retaining and releasing positions.

again, to slide freely upon the seating surfaces 5 upon contraction ofthe spring in the limiting positions of the handle.

If desired, ribs 41 may be formed on the side of the front head and suchribs may diverge'from the notch 40 to form a substantial protection forthe spring againstdamage.

In the operation of the drill, whenever it is desired to remove theworking implement from the front head the retaining member 32 is rockedout of the retaining position by pressure. applied to the upper end ofthe handle 34. The handle 34 is then rocked about the fulcrum 31 to aposition in which it rests against the side of the front head. Thismovement 'of the handle will cause the portion of the spring 38 lying inthe notch 39 to be shifted above the fulcrum 3'! and the spring willthen hold the retaining member in the releasing position.

After a working implement has again been placed in the front head thehandle 34 is rocked outwardly and the retaining member 32 is thenreturned to its retaining position and held thus by. the spring 38 whichwill then again lie forwardly of the fulcrum 3Tand hold the handle 34firmly'against the seating surface 36.

I claim: I

1. In an implement retainer, comprising in combination with a front headand a working implement having a collar, a seating surface on the fronthead, a retaining member seating upon the seating surface-and extendingintothe path of the collar, a handle on the retaining member, a fulcrumon the front head for the'handle, and spring-means pivotally attachedtothe front head acting against the handle and movable across thefulcrum to hold the retaining member in the retaining and releasingpositions and 3. In an implement retainer, comp-rising in combinationwith a front head and a working implement having a collar, a seatingsurface on the front head, a retaining member seating upon the seatingsurface and extending into the path of the collar, a fulcrum for theretainer, and a spring embracing the front head and theretaining memberand being shiftable toithe opposite sides of the fulcrum accordingly asthe retaining member is rocked about thefulcrum for holding theretaining member in the retaining and releasing positions" a 4. In animplement retainer, comprising in combination with a front head and aworking implement having a collar, a retaining member extending into thepath of the collar, a handle on the retaining member,. a fulcrum on thefront head for the handle, and a spring embracing the front head and.the handle having a portion in engagement with the front. head andanother portion connected to the handle and swingable therewithrelatively to the fulcrum for holding the retaining member in theretaining and releasing positions.

5. In an implement retainer, comprising in combination with a front headand a working implement having a. collar, an. inclined seating surfaceon the front head, guide members on the opposite sides of the inclinedseating surface extending longitudinally of the, front head; a

face and extending into the path of the collar,

a handle on the retaining member lying between the guide members, afulcrum for the handle, and

a spring interlockingly engaging the fronthead embracing the handle andbeing swingable with the handle about the fulcrum for holding theretaining member in the retaining and releasing positions and to securethe retaining member to the front head.

GEORGE H. FUEHRER.

